EP3789160B1 - Clamp for holding a block of material on a machining table, clamping device comprising said clamp and method for clamping a block of material on a machining table - Google Patents

Clamp for holding a block of material on a machining table, clamping device comprising said clamp and method for clamping a block of material on a machining table Download PDF

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Publication number
EP3789160B1
EP3789160B1 EP20193981.6A EP20193981A EP3789160B1 EP 3789160 B1 EP3789160 B1 EP 3789160B1 EP 20193981 A EP20193981 A EP 20193981A EP 3789160 B1 EP3789160 B1 EP 3789160B1
Authority
EP
European Patent Office
Prior art keywords
clamp
block
face
machining table
machining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20193981.6A
Other languages
German (de)
French (fr)
Other versions
EP3789160A1 (en
Inventor
Arnaud HAMON
Vincent LHOPITAL
Anthony Loyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Operations SAS
Original Assignee
Airbus Operations SAS
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Filing date
Publication date
Application filed by Airbus Operations SAS filed Critical Airbus Operations SAS
Publication of EP3789160A1 publication Critical patent/EP3789160A1/en
Application granted granted Critical
Publication of EP3789160B1 publication Critical patent/EP3789160B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
    • B23Q3/102—Auxiliary devices, e.g. bolsters, extension members for fixing elements in slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/10—Arrangements for positively actuating jaws using screws
    • B25B5/104—Arrangements for positively actuating jaws using screws with one screw and one clamping lever and one fulcrum element
    • B25B5/105—Arrangements for positively actuating jaws using screws with one screw and one clamping lever and one fulcrum element with one end of the lever resting on a table and the screw being positioned between the ends of the lever
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/069—Work-clamping means for pressing workpieces against a work-table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/10—Auxiliary devices, e.g. bolsters, extension members
    • B23Q3/103—Constructional elements used for constructing work holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/006—Supporting devices for clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/10—Arrangements for positively actuating jaws using screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • B25B5/166—Slideways; Guiding and/or blocking means for jaws thereon

Definitions

  • the present application relates to a clamp for holding a block of material on a machining table, to a clamping device comprising said clamp and to a method for clamping a block of material on a work table. machining.
  • a part is produced by machining a block of material 10, for example of aluminum alloy, fixed on a machining table 12.
  • the block of material 10 has a bearing surface 10.1, pressed against a bearing surface 12.1 of the machining table 12, and at least one side surface 10.2 approximately perpendicular to the bearing surface 12.1 of the machining table 12.
  • a clamping device is used to hold the block of material 10 stationary on the machining table 12.
  • the clamping device comprises at least one groove 14 provided on the side surface 10.2 of the block of material 10 as well as at least one flange 16 secured in a removable manner to the machining table 12 and configured to cooperate with the groove 14 of the material block 10.
  • Each flange 16 comprises an approximately parallelepipedal body 18 which has a first face 18.1 oriented towards the machining table 12, a second face 18.2 opposite the first face 18.1, a third so-called front face 18.3 oriented towards the block of material 10 in operation as well as a fourth face 18.4 opposite the front face 18.3.
  • the flange 16 comprises a heel 20 projecting from the first face 18.1, positioned in the extension of the fourth face 18.4 and configured to be in contact against the bearing surface 12.1 of the machining table 12 in operation, as well as a nose 22 projecting from the front face 18.3, positioned in the extension of the second face 18.2 and dimensioned to be housed in the groove 14 of the block of material 10 in operation.
  • Each flange 16 also comprises a connection system 24 allowing it to be connected, in a removable manner, to the machining table 12.
  • the latter comprises several T-slots 26 emerging at the level of the laying surface 12.1.
  • a connection system 24 comprises an oblong hole 28 passing through the body 18 of the flange 16 and emerging at the level of the first and second faces 18.1, 18.2, a screw 30 having a head 30.1 resting against the body 18 of the flange 16 and a threaded rod 30.2 housed in the oblong hole 28, as well as a gib 32 configured to be housed in one of the T-slots 26 of the machining table 12 and into which the threaded rod is screwed 30.2 of screw 30 in operation.
  • the block of material 10 is positioned on the latter and the flanges 16 are positioned so that, for each of them, the nose 22 is housed in one of the grooves 14 of the block of material 10.
  • the screw 30 is screwed so that the nose 22 of each flange 16 exerts a pressing force on the block of material 10 in the direction of the machining table 12.
  • This type of flange makes it possible to perfectly immobilize the block of material 10 on the machining table 12 whatever the orientation of the latter, vertical or horizontal. However, it requires the presence of at least two grooves 14 on the block of material, which increases its price.
  • the subject of the invention is a clamp for holding a block of material on a machining table, the clamp comprising a body which has a first face and at least a first front face, oriented respectively towards the working table. machining and the block of material in operation, as well as a connection system to connect the flange, in a removable manner, to the machining table.
  • the body of the flange comprises a nose, projecting relative to the first front face, having a second front face parallel to the first front face as well as first and second edges connecting the first and second front faces, said nose being sized to fit in a groove of a working block of material; in that the body comprises at least one tapped hole opening into the at least partially at the level of the second front face and having an axis forming a non-zero angle with the first face and the second front face and in that the flange comprises at least one grub screw, which is screwed into the tapped hole, having one end free point configured to penetrate the block of material in operation when screwing in the needle screw.
  • the axis of the tapped hole forms with the second front face an angle of between 30 and 60°.
  • the body comprises at least one insert having the tapped hole.
  • connection system comprises a gib configured to be inserted into a T-slot of the working table in operation, at least one passage hole provided at the level of the body of the flange as well as at least one screw, one for each passage hole, having a threaded rod configured to be housed in the passage hole and to be screwed into the gib, each passage hole having a diameter slightly greater than that of the threaded rod of the screw.
  • the tapped hole opens at the level of the second front face and of the first edge closest to the first face.
  • the axis of the tapped hole intersects with an edge connecting the second front face and the first edge.
  • the flange comprises a wedge connected in a removable manner to the body, positioned on the first face and projecting with respect to said first face.
  • the invention also relates to a clamping device comprising at least one clamp according to one of the preceding characteristics.
  • the invention also relates to a method for clamping a block of material on a machining table, characterized in that the clamping method comprises a step of moving clamps according to one of the preceding characteristics on the table. machining until the nose of each flange is in contact with the block of material, the needle screw of each flange not projecting with respect to the second front face, a clamping step of at least one screw of the connecting system of each flange to a first tightening torque to immobilize each flange with respect to the machining table, then a step of tightening the needle screw of each flange to a second tightening torque so that the pointed free end of the needle screw penetrates the material of the block of material.
  • the second tightening torque is lower than the first tightening torque.
  • the invention also relates to a method for machining a block of material comprising two bearing surfaces and at least one lateral surface, characterized in that the machining method comprises a first machining phase during which the first bearing surface of the block of material is held pressed against the machining table thanks to clamps (according to the invention) using the clamping process (according to one of the preceding characteristics) then a groove is made on one of the side surfaces of the block of material, as well as a second phase of machining during which the second bearing surface of the block of material is held pressed against the machining table thanks to the clamps, the conical needle screw each flange not projecting relative to the second front surface, the nose of each flange being housed in the groove.
  • FIG. 7 and 10 there is shown a clamping device making it possible to hold a block of material 40 immobile on a machining table 42.
  • the machining table 42 has a plane bearing surface 42.1, intended to receive the block of material 40, and several T-slots 44 opening out at the level of the bearing surface 42.1.
  • the machining table 42 can be oriented horizontally, as shown in the figure 7 , or vertically, as shown in the figure 10 .
  • the machining table 42 is integrated into a machining machine, such as for example a machining center, which comprises, in addition to the machining table, at least one machining head 46 (visible on the figure 8 ) equipped with a tool 48, such as a milling cutter, configured to make a groove 50 in the block of material 40.
  • a machining machine such as for example a machining center
  • a tool 48 such as a milling cutter
  • the machining table 42 is not further described because it is known to those skilled in the art. Moreover, it is not limited to the embodiments visible on the figures 7 to 10 .
  • the block of material 40 is metallic, for example aluminum alloy, and has an approximately parallelepipedic shape. It has a first support surface 52.1, intended to rest against the resting surface 42.1 of the machining table 42 during a first machining phase, as illustrated in the figures 7 and 8 ; a second support surface 52.2, approximately parallel to the first support surface 52.1, intended to rest against the bearing surface 42.1 of the machining table 42 during a second machining phase, as illustrated in the figure 9 ; as well as first and second side surfaces 54.1, 54.2, parallel to each other, approximately perpendicular to the laying surface 42.1 in operation.
  • the first and second lateral surfaces 54.1, 54.2 may have no grooves.
  • the invention is not limited to this embodiment for the block of material 40.
  • the latter comprises at least one support surface 52.1 and at least one side surface 54.1.
  • the clamping device comprises at least one clamp 56 secured in a removable manner to the machining table 42 and configured to cooperate with the block of material 40 in operation so as to keep it immobile against the resting surface 42.1 of the work table. machining 42.
  • the clamping device generally comprises several clamps 56 distributed along the first and second side surfaces 54.1, 54.2. According to one configuration, the clamping device comprises at least one first flange 56 cooperating in operation with the first side surface 54.1 of the block of material 40 and at least one second flange 56' cooperating in operation with the second side surface 54.2.
  • the flange 56 comprises a body 58 which has a first face 60 oriented towards the machining table 42 in operation, at least one end face 62, 62' oriented towards the block of material 40 in operation as well as 'at least one tapped hole 64 opening out at least partially at the front face 62, 62'.
  • the first face 60 and the front face 62, 62' are substantially planar.
  • the first face 60 and the front face 62, 62' form between them an angle complementary to the angle formed by the first support surface 52.1 and one of the first and second side surfaces 54.1, 54.2 of the block of material 40.
  • the side surfaces 54.1, 54.2 of the block of material 40 are perpendicular to the first bearing surface 52.1, then the first face 60 and the front face 62, 62' are perpendicular.
  • the first face 60 and the front face 62, 62' extend between first and second side faces 66.1, 66.2 approximately parallel to each other and approximately perpendicular to the first face 60 and to the front face 62, 62'.
  • a longitudinal direction is perpendicular to the front face 62, 62'.
  • a longitudinal plane is a plane perpendicular to the first face 60 and the front face 62, 62'.
  • a median longitudinal plane is equidistant from the first and second side faces 66.1, 66.2.
  • the first face 60 and the front face 62, 62' can be pressed respectively against the bearing surface 42.1 of the machining table 42 and one of the side surfaces 54.1, 54.2 of the block of material 40.
  • each tapped hole 64 has an axis A64, positioned in a median longitudinal plane, forming a non-zero angle with the first face 60 and the front face 62, 62'.
  • the axis A64 forms with the front face 62, 62' an angle of between 30 and 60°.
  • the flange 56 comprises, in addition to the body 58, at least one set screw 68 which screws into the tapped hole 64 in operation.
  • Each conical screw 68 has a head 70 for screwing and unscrewing it as well as a threaded rod 72 configured to be screwed into the tapped hole 64, comprising a pointed free end 72.1 configured to penetrate into the block of material 40 in operation during a screwing of the needle screw 68.
  • the needle screw 68 is made of a harder material than the block of material 40 to allow its pointed free end 72.1 to penetrate the block of material 40.
  • the needle screw 68 is configured to occupy a recessed position in which it does not project with respect to the front face 62, 62' and an extended position in which the pointed free end 72.1 of the needle screw 68 projects with respect to the front face 62, 62'.
  • the front face 62 is flat and the body 58 of the flange does not include a nose.
  • the body 58 comprises a nose 74.
  • the body 58 comprises a first front face 62 as well as a rib, projecting with respect to the first front face 62 and forming the nose 74, having a second face front 62' parallel to the first front face 62 as well as first and second edges 76.1, 76.2 connecting the first and second front faces 62, 62', approximately parallel to the first face 60 of the body 58 of the flange 56.
  • the nose 74 in particular its second front face 62' as well as its first and second edges 76.1, 76.2, is sized to be housed in the groove 50 of the block of material 40 during a second machining phase and allow effective plating of the block of material 40 against the machining table 42 when the first edge 76.1 of the nose 74, closest to the first face 60, is in contact with the block of material 40.
  • the nose 74 extends from the first side face 66.1 to the second side face 66.2.
  • the tapped hole 64 opens at the level of the second front face 62' and of the first edge 76.1.
  • the axis A64 of the tapped hole 64 intersects with an edge 78 connecting the second front face 62' and the first edge 76.1.
  • the body 58 of the flange 56 comprises a second face 60' parallel to the first face 60.
  • the first front face 62 extends from a first edge 62.1 in the extension of the first face 60 to a second edge 62.2 , offset from the second face 60 ', connected to the latter by a surface which has an inclined face 80 approximately perpendicular to the axis A64 of the tapped hole 64.
  • the nose 74 is distant from the first and second edges 62.1, 62.2.
  • the body 58 comprises at least one insert 82 comprising the tapped hole 64 and inserted into a smooth hole 84 of the body 58.
  • Each flange 56 also includes a connection system 86 to releasably connect it to the machining table 42.
  • connection system 86 comprises a gib 88 configured to be inserted into a T-slot 44 of the machining table 42, at least one passage hole 90, provided at the level of the body 58 of the flange 56, emerging at the level of the first and second faces 60, 60' of the body 58, as well as at least one screw 92, one for each passage hole 90, which has a head 92.1, configured to bear against the second face 60 'of the body 58, and a threaded rod 92.2 configured to fit into the passage hole 90 and screw into the gib 88.
  • the connecting system 86 comprises two passage holes 90 positioned in the median longitudinal plane.
  • each passage hole 90 has a diameter slightly greater than that of the threaded rod 92.2 of the screw 92 to allow a slight inclination of the body 58 of the flange 56 when the nose 74 is used to hold the block of material 40.
  • the body 58 and the gib 88 of the flange 56 are made of treated steel.
  • screws 92 are M12 screws and needle screw 68 is an M10 screw.
  • the flange 56 comprises a wedge 98 removably connected to the body 58, positioned on the first face 60, projecting relative to said first face 60 so that this first face 60 is slightly spaced from the laying surface 42.1 of the machining table 42 in operation.
  • the body 58 comprises a housing 100, configured to house the wedge 98, positioned at the intersection of the first face 60 and the rear face 102 of the body 58.
  • This housing 100 extends over the entire width of the body 58.
  • the wedge 98 has a rectangular section and extends over the entire width of the body 58.
  • the wedge 98 and the housing 100 are dimensioned so that the wedge 98 projects slightly, of the order of millimeter, relative to the first face 60 of the body.
  • the wedge 98 is connected to the body 58 by removable connecting elements 104, such as screws for example.
  • the wedge 98 is made of a material less hard than the machining table 42 to limit the risk of damage to this machining table 42.
  • the wedge 98 can be removed to be able to change it, without changing the entire flange 56 when it is worn out.
  • flange 56 is described with regard to figures 7 to 9 .
  • the block of material 40 devoid of a groove, is placed on the machining table 42.
  • the flanges 56 are distributed on either side of the block of material 40, the gib 88 of each of them being introduced into the T-slot 44 of the work table 42.
  • the clamping method comprises a step of moving the clamps 56 on the work table 42 until the second end face 62' of each clamp 56 is in contact with the block of material 40, the needle screws 68 being in recessed position; a step of tightening at least one screw 92 of the connection system 86 of each flange 56 to a first tightening torque, for example of the order of 80N.m, to immobilize each flange 56 with respect to the table of machining 42; then a step of screwing the needle screws 68 to a second tightening torque, lower than the first tightening torque, of the order of 30 N.m so that the pointed free end 72.1 of each needle screw 68 penetrates into the material of the block of material 40.
  • the block of material 40 is held stationary by the various flanges 56.
  • the clamping device of the invention can also hold a block of material 40 stationary on a horizontal work table, as illustrated in the figure 7 , than on a vertical machining table 42, as illustrated in the figure 10 .
  • the method of machining the block of material 40 comprises a first phase of machining during which the first support surface 52.1 of the block of material 40 is kept pressed against the machining table 42 thanks to the flanges 56, as previously described, and a groove 50 made on one of the side surfaces 54.1, 54.2 of the block of material 40, using a standard tool, as illustrated in the figure 8 .
  • a groove 50 is made on each of the side surfaces 54.1 and 54.2 of the block of material.
  • Other machining operations can be performed on the second bearing surface 52.2
  • the set screws 68 and the screws 92 of the flanges 56 are unscrewed.
  • the block of material 40 can then be turned over, so as to press its second support surface 52.2 against the machining table 42.
  • the grub screw 68 of each flange 56 being in the retracted position, the flanges 56 are moved up to that the nose 74 of each of them is introduced into one of the grooves 50 of the block of material 40. It is then sufficient to screw the screws 92 of each flange 56 to keep the block of material 40 immobilized on the table.
  • the same flange 56 visible on the figures 3 to 5 and 7 to 10 allows the block of material 40 to be clamped using either the needle screw 68 or the nose 74.
  • the clamping of the block of material 40 using the nose 74 makes it possible to limit the risks of deformation of the block of material 40, the effort of plating 94 exerted by the flange 56 on the block of material 40 being oriented only in a direction perpendicular to the bearing surface 42.1 of the machining table 42 while the clamping of the block of material 40 using the needle screw 68 generates a pressing force 96 with a component perpendicular to the bearing surface 42.1 of the machining table 42 and a component parallel to the bearing surface 42.1 of the machining table 42 which may tend to deform the block of material 40 depending of its geometry.

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  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
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Description

La présente demande se rapporte à une bride de maintien d'un bloc de matière sur une table d'usinage, à un dispositif de bridage comprenant ladite bride ainsi qu'à un procédé de bridage d'un bloc de matière sur une table d'usinage.The present application relates to a clamp for holding a block of material on a machining table, to a clamping device comprising said clamp and to a method for clamping a block of material on a work table. machining.

Selon un mode de fabrication, une pièce est réalisée en usinant un bloc de matière 10, par exemple en alliage d'aluminium, fixé sur une table d'usinage 12. Selon une configuration, le bloc de matière 10 présente une surface d'appui 10.1, plaquée contre une surface de pose 12.1 de la table d'usinage 12, et au moins une surface latérale 10.2 approximativement perpendiculaire à la surface de pose 12.1 de la table d'usinage 12.According to one mode of manufacture, a part is produced by machining a block of material 10, for example of aluminum alloy, fixed on a machining table 12. According to one configuration, the block of material 10 has a bearing surface 10.1, pressed against a bearing surface 12.1 of the machining table 12, and at least one side surface 10.2 approximately perpendicular to the bearing surface 12.1 of the machining table 12.

Un dispositif de bridage est utilisé pour maintenir le bloc de matière 10 immobile sur la table d'usinage 12. Selon un mode de réalisation visible sur les figures 1 et 2, le dispositif de bridage comprend au moins une rainure 14 prévue sur la surface latérale 10.2 du bloc de matière 10 ainsi qu'au moins une bride 16 solidarisée de manière démontable à la table d'usinage 12 et configurée pour coopérer avec la rainure 14 du bloc de matière 10.A clamping device is used to hold the block of material 10 stationary on the machining table 12. According to one embodiment visible on the figures 1 and 2 , the clamping device comprises at least one groove 14 provided on the side surface 10.2 of the block of material 10 as well as at least one flange 16 secured in a removable manner to the machining table 12 and configured to cooperate with the groove 14 of the material block 10.

Chaque bride 16 comprend un corps 18 approximativement parallélépipédique qui présente une première face 18.1 orientée vers la table d'usinage 12, une deuxième face 18.2 opposée à la première face 18.1, une troisième face dite frontale 18.3 orientée vers le bloc de matière 10 en fonctionnement ainsi qu'une quatrième face 18.4 opposée à la face frontale 18.3. La bride 16 comprend un talon 20 en saillie par rapport à la première face 18.1, positionné dans le prolongement de la quatrième face 18.4 et configuré pour être en contact contre la surface de pose 12.1 de la table d'usinage 12 en fonctionnement, ainsi qu'un nez 22 en saillie par rapport à la face frontale 18.3, positionné dans le prolongement de la deuxième face 18.2 et dimensionné pour se loger dans la rainure 14 du bloc de matière 10 en fonctionnement.Each flange 16 comprises an approximately parallelepipedal body 18 which has a first face 18.1 oriented towards the machining table 12, a second face 18.2 opposite the first face 18.1, a third so-called front face 18.3 oriented towards the block of material 10 in operation as well as a fourth face 18.4 opposite the front face 18.3. The flange 16 comprises a heel 20 projecting from the first face 18.1, positioned in the extension of the fourth face 18.4 and configured to be in contact against the bearing surface 12.1 of the machining table 12 in operation, as well as a nose 22 projecting from the front face 18.3, positioned in the extension of the second face 18.2 and dimensioned to be housed in the groove 14 of the block of material 10 in operation.

Chaque bride 16 comprend également un système de liaison 24 permettant de la relier, de manière démontable, à la table d'usinage 12. A cet effet, cette dernière comprend plusieurs rainures en T 26 débouchant au niveau de la surface de pose 12.1. Selon un mode de réalisation, un système de liaison 24 comprend un trou oblong 28 traversant le corps 18 de la bride 16 et débouchant au niveau des première et deuxième faces 18.1, 18.2, une vis 30 présentant une tête 30.1 en appui contre le corps 18 de la bride 16 et une tige filetée 30.2 logée dans le trou oblong 28, ainsi qu'un lardon 32 configuré pour se loger dans l'une des rainures en T 26 de la table d'usinage 12 et dans lequel se visse la tige filetée 30.2 de la vis 30 en fonctionnement.Each flange 16 also comprises a connection system 24 allowing it to be connected, in a removable manner, to the machining table 12. For this purpose, the latter comprises several T-slots 26 emerging at the level of the laying surface 12.1. According to one embodiment, a connection system 24 comprises an oblong hole 28 passing through the body 18 of the flange 16 and emerging at the level of the first and second faces 18.1, 18.2, a screw 30 having a head 30.1 resting against the body 18 of the flange 16 and a threaded rod 30.2 housed in the oblong hole 28, as well as a gib 32 configured to be housed in one of the T-slots 26 of the machining table 12 and into which the threaded rod is screwed 30.2 of screw 30 in operation.

Pour le maintenir immobile sur la table d'usinage 12, le bloc de matière 10 est positionné sur cette dernière et les brides 16 sont positionnées de sorte que, pour chacune d'elles, le nez 22 soit logé dans l'une des rainures 14 du bloc de matière 10. En suivant, la vis 30 est vissée de sorte que le nez 22 de chaque bride 16 exerce un effort de plaquage sur le bloc de matière 10 en direction de la table d'usinage 12.To keep it immobile on the machining table 12, the block of material 10 is positioned on the latter and the flanges 16 are positioned so that, for each of them, the nose 22 is housed in one of the grooves 14 of the block of material 10. Next, the screw 30 is screwed so that the nose 22 of each flange 16 exerts a pressing force on the block of material 10 in the direction of the machining table 12.

Ce type de bride permet de parfaitement immobiliser le bloc de matière 10 sur la table d'usinage 12 quelle que soit l'orientation de cette dernière verticale ou horizontale. Toutefois, elle requiert la présence d'au moins deux rainures 14 sur le bloc de matière, ce qui surenchérit son prix.This type of flange makes it possible to perfectly immobilize the block of material 10 on the machining table 12 whatever the orientation of the latter, vertical or horizontal. However, it requires the presence of at least two grooves 14 on the block of material, which increases its price.

Le document US2014/0363252 décrit des brides permettant de maintenir un bloc de matière sur une table d'usinage. Cette bride est sensiblement parallélépipédique et comprend un trou taraudé traversant, approximativement horizontal, configuré pour loger une vis pointeau. Ce mode de réalisation ne permet pas d'assurer un maintien efficace du bloc de matière sur la table d'usinage.The document US2014/0363252 describes clamps for holding a block of material on a machining table. This flange is substantially parallelepiped and includes a threaded through hole, approximately horizontal, configured to accommodate a set screw. This embodiment does not make it possible to ensure effective maintenance of the block of material on the machining table.

La présente invention vise à remédier à tout ou partie des inconvénients de l'art antérieur. A cet effet, l'invention a pour objet une bride pour maintenir un bloc de matière sur une table d'usinage, la bride comprenant un corps qui présente une première face et au moins une première face frontale, orientées respectivement vers la table d'usinage et le bloc de matière en fonctionnement, ainsi qu'un système de liaison pour relier la bride, de manière démontable, à la table d'usinage.The present invention aims to remedy all or part of the drawbacks of the prior art. To this end, the subject of the invention is a clamp for holding a block of material on a machining table, the clamp comprising a body which has a first face and at least a first front face, oriented respectively towards the working table. machining and the block of material in operation, as well as a connection system to connect the flange, in a removable manner, to the machining table.

Selon l'invention, le corps de la bride comprend un nez, en saillie par rapport à la première face frontale, présentant une deuxième face frontale parallèle à la première face frontale ainsi que des premier et deuxième chants reliant les première et deuxième faces frontales, ledit nez étant dimensionné pour se loger dans une rainure d'un bloc de matière en fonctionnement; en ce que le corps comprend au moins un trou taraudé débouchant au moins partiellement au niveau de la deuxième face frontale et présentant un axe formant un angle non nul avec la première face et la deuxième face frontale et en ce que la bride comprend au moins une vis pointeau, se vissant dans le trou taraudé, présentant une extrémité libre pointue configurée pour pénétrer dans le bloc de matière en fonctionnement lors d'un vissage de la vis pointeau.According to the invention, the body of the flange comprises a nose, projecting relative to the first front face, having a second front face parallel to the first front face as well as first and second edges connecting the first and second front faces, said nose being sized to fit in a groove of a working block of material; in that the body comprises at least one tapped hole opening into the at least partially at the level of the second front face and having an axis forming a non-zero angle with the first face and the second front face and in that the flange comprises at least one grub screw, which is screwed into the tapped hole, having one end free point configured to penetrate the block of material in operation when screwing in the needle screw.

Ainsi, il est possible, grâce à cette bride, de maintenir sur la table d'usinage un bloc de matière dépourvu de rainures sur ses surfaces latérales.Thus, it is possible, thanks to this flange, to maintain on the work table a block of material devoid of grooves on its side surfaces.

Selon une autre caractéristique, l'axe du trou taraudé forme avec la deuxième face frontale un angle compris entre 30 et 60°.According to another characteristic, the axis of the tapped hole forms with the second front face an angle of between 30 and 60°.

Selon une autre caractéristique, le corps comprend au moins un insert présentant le trou taraudé.According to another characteristic, the body comprises at least one insert having the tapped hole.

Selon une autre caractéristique, le système de liaison comprend un lardon configuré pour être inséré dans une rainure en T de la table d'usinage en fonctionnement, au moins un trou de passage prévu au niveau du corps de la bride ainsi qu'au moins une vis, une pour chaque trou de passage, présentant une tige filetée configurée pour se loger dans le trou de passage et se visser dans le lardon, chaque trou de passage ayant un diamètre légèrement supérieur à celui de la tige filetée de la vis.According to another characteristic, the connection system comprises a gib configured to be inserted into a T-slot of the working table in operation, at least one passage hole provided at the level of the body of the flange as well as at least one screw, one for each passage hole, having a threaded rod configured to be housed in the passage hole and to be screwed into the gib, each passage hole having a diameter slightly greater than that of the threaded rod of the screw.

Selon une autre caractéristique, le trou taraudé débouche au niveau de la deuxième face frontale et du premier chant le plus proche de la première face.According to another characteristic, the tapped hole opens at the level of the second front face and of the first edge closest to the first face.

Selon une autre caractéristique, l'axe du trou taraudé est sécant avec une arête reliant la deuxième face frontale et le premier chant.According to another characteristic, the axis of the tapped hole intersects with an edge connecting the second front face and the first edge.

Selon une autre caractéristique, la bride comprend une cale reliée de manière démontable au corps, positionnée sur la première face et en saillie par rapport à ladite première face. L'invention a également pour objet un dispositif de bridage comprenant au moins une bride selon l'une des caractéristiques précédentes.According to another characteristic, the flange comprises a wedge connected in a removable manner to the body, positioned on the first face and projecting with respect to said first face. The invention also relates to a clamping device comprising at least one clamp according to one of the preceding characteristics.

L'invention a également pour objet un procédé de bridage d'un bloc de matière sur une table d'usinage, caractérisé en ce que le procédé de bridage comprend une étape de déplacement de brides selon l'une des caractéristiques précédentes sur la table d'usinage jusqu'à ce que le nez de chaque bride soit en contact avec le bloc de matière, la vis pointeau de chaque bride n'étant pas en saillie par rapport à la deuxième face frontale, une étape de serrage d'au moins une vis du système de liaison de chaque bride à un premier couple de serrage pour immobiliser chaque bride par rapport à la table d'usinage, puis une étape de vissage de la vis pointeau de chaque bride à un deuxième couple de serrage afin que l'extrémité libre pointue de la vis pointeau pénètre dans la matière du bloc de matière. Selon une autre caractéristique, le deuxième couple de serrage est inférieur au premier couple de serrage.The invention also relates to a method for clamping a block of material on a machining table, characterized in that the clamping method comprises a step of moving clamps according to one of the preceding characteristics on the table. machining until the nose of each flange is in contact with the block of material, the needle screw of each flange not projecting with respect to the second front face, a clamping step of at least one screw of the connecting system of each flange to a first tightening torque to immobilize each flange with respect to the machining table, then a step of tightening the needle screw of each flange to a second tightening torque so that the pointed free end of the needle screw penetrates the material of the block of material. According to another characteristic, the second tightening torque is lower than the first tightening torque.

L'invention a également pour objet un procédé d'usinage d'un bloc de matière comprenant deux surfaces d'appui et au moins une surface latérale, caractérisé en ce que le procédé d'usinage comprend une première phase d'usinage lors de laquelle la première surface d'appui du bloc de matière est maintenue plaquée contre la table d'usinage grâce à des brides (selon l'invention) en utilisant le procédé de bridage (selon l'une des caractéristiques précédentes) puis une rainure est réalisée sur l'une des surfaces latérales du bloc de matière, ainsi qu'une deuxième phase d'usinage lors de laquelle la deuxième surface d'appui du bloc de matière est maintenue plaquée contre la table d'usinage grâce aux brides, la vis pointeau de chaque bride n'étant pas en saillie par rapport à la deuxième surface frontale, le nez de chaque bride étant logé dans la rainure.The invention also relates to a method for machining a block of material comprising two bearing surfaces and at least one lateral surface, characterized in that the machining method comprises a first machining phase during which the first bearing surface of the block of material is held pressed against the machining table thanks to clamps (according to the invention) using the clamping process (according to one of the preceding characteristics) then a groove is made on one of the side surfaces of the block of material, as well as a second phase of machining during which the second bearing surface of the block of material is held pressed against the machining table thanks to the clamps, the conical needle screw each flange not projecting relative to the second front surface, the nose of each flange being housed in the groove.

D'autres caractéristiques et avantages ressortiront de la description de l'invention qui va suivre, description donnée à titre d'exemple uniquement, en regard des dessins annexés parmi lesquels :

  • La figure 1 est une vue de face d'un dispositif de bridage illustrant un mode de réalisation de l'art antérieur,
  • La figure 2 est une vue latérale d'un dispositif de bridage illustrant un mode de réalisation de l'art antérieur,
  • La figure 3 est une vue en perspective d'une bride illustrant un mode de réalisation de l'invention,
  • La figure 4 est une vue en perspective en éclaté de la bride visible sur la figure 3,
  • La figure 5 est une coupe longitudinale d'un corps de bride qui illustre un mode de réalisation de l'invention,
  • La figure 6 est une coupe longitudinale d'un corps de bride qui illustre un autre mode de réalisation,
  • La figure 7 est une vue latérale d'un dispositif de bridage qui illustre un mode de réalisation de l'invention selon une configuration horizontale,
  • La figure 8 est une vue latérale d'une partie du dispositif de bridage visible sur la figure 7 lors d'une première phase d'usinage,
  • La figure 9 est une vue latérale d'une partie du dispositif de bridage visible sur la figure 7 lors d'une deuxième phase d'usinage,
  • La figure 10 est une vue latérale d'un dispositif de bridage qui illustre un mode de réalisation de l'invention selon une configuration verticale,
  • La figure 11 est une vue en perspective d'une bride illustrant un autre mode de réalisation de l'invention, et
  • La figure 12 est une vue latérale de la bride visible sur la figure 11.
Other characteristics and advantages will emerge from the description of the invention which follows, description given by way of example only, with reference to the appended drawings, among which:
  • The figure 1 is a front view of a clamping device illustrating an embodiment of the prior art,
  • The picture 2 is a side view of a clamping device illustrating an embodiment of the prior art,
  • The picture 3 is a perspective view of a flange illustrating one embodiment of the invention,
  • The figure 4 is an exploded perspective view of the flange visible on the picture 3 ,
  • The figure 5 is a longitudinal section of a flange body which illustrates an embodiment of the invention,
  • The figure 6 is a longitudinal section of a flange body which illustrates another embodiment,
  • The figure 7 is a side view of a clamping device which illustrates an embodiment of the invention in a horizontal configuration,
  • The figure 8 is a side view of part of the clamping device visible on the figure 7 during a first machining phase,
  • The figure 9 is a side view of part of the clamping device visible on the figure 7 during a second machining phase,
  • The figure 10 is a side view of a clamping device which illustrates an embodiment of the invention in a vertical configuration,
  • The figure 11 is a perspective view of a flange illustrating another embodiment of the invention, and
  • The figure 12 is a side view of the flange visible on the figure 11 .

Sur les figures 7 et 10, on a représenté un dispositif de bridage permettant de maintenir immobile un bloc de matière 40 sur une table d'usinage 42.On the figure 7 and 10 , there is shown a clamping device making it possible to hold a block of material 40 immobile on a machining table 42.

Selon une configuration, la table d'usinage 42 présente une surface de pose 42.1 plane, destinée à recevoir le bloc de matière 40, et plusieurs rainures en T 44 débouchant au niveau de la surface de pose 42.1. La table d'usinage 42 peut être orientée horizontalement, comme illustré sur la figure 7, ou verticalement, comme illustré sur la figure 10.According to one configuration, the machining table 42 has a plane bearing surface 42.1, intended to receive the block of material 40, and several T-slots 44 opening out at the level of the bearing surface 42.1. The machining table 42 can be oriented horizontally, as shown in the figure 7 , or vertically, as shown in the figure 10 .

Selon une application, la table d'usinage 42 est intégrée à une machine d'usinage, comme par exemple un centre d'usinage, qui comprend, en plus de la table d'usinage, au moins une tête d'usinage 46 (visible sur la figure 8) équipée d'un outil 48, comme par exemple une fraise, configuré pour réaliser une rainure 50 dans le bloc de matière 40.According to one application, the machining table 42 is integrated into a machining machine, such as for example a machining center, which comprises, in addition to the machining table, at least one machining head 46 (visible on the figure 8 ) equipped with a tool 48, such as a milling cutter, configured to make a groove 50 in the block of material 40.

La table d'usinage 42 n'est pas plus décrite car elle est connue de l'homme du métier. De plus, elle n'est pas limitée aux modes de réalisation visibles sur les figures 7 à 10.The machining table 42 is not further described because it is known to those skilled in the art. Moreover, it is not limited to the embodiments visible on the figures 7 to 10 .

Selon un mode de réalisation, le bloc de matière 40 est métallique, par exemple en alliage d'aluminium, et a une forme approximativement parallélépipédique. Il présente une première surface d'appui 52.1, destinée à être en appui contre la surface de pose 42.1 de la table d'usinage 42 lors d'une première phase d'usinage, comme illustré sur les figures 7 et 8 ; une deuxième surface d'appui 52.2, approximativement parallèle à la première surface d'appui 52.1, destinée à être en appui contre la surface de pose 42.1 de la table d'usinage 42 lors d'une deuxième phase d'usinage, comme illustré sur la figure 9 ; ainsi que des première et deuxième surfaces latérales 54.1, 54.2, parallèles entre elles, approximativement perpendiculaires à la surface de pose 42.1 en fonctionnement. Selon une particularité de l'invention, les première et deuxième surfaces latérales 54.1, 54.2 peuvent être dépourvues de rainures.According to one embodiment, the block of material 40 is metallic, for example aluminum alloy, and has an approximately parallelepipedic shape. It has a first support surface 52.1, intended to rest against the resting surface 42.1 of the machining table 42 during a first machining phase, as illustrated in the figures 7 and 8 ; a second support surface 52.2, approximately parallel to the first support surface 52.1, intended to rest against the bearing surface 42.1 of the machining table 42 during a second machining phase, as illustrated in the figure 9 ; as well as first and second side surfaces 54.1, 54.2, parallel to each other, approximately perpendicular to the laying surface 42.1 in operation. According to a feature of the invention, the first and second lateral surfaces 54.1, 54.2 may have no grooves.

Bien entendu, l'invention n'est pas limitée à ce mode de réalisation pour le bloc de matière 40. A minima, ce dernier comprend au moins une surface d'appui 52.1 et au moins une surface latérale 54.1.Of course, the invention is not limited to this embodiment for the block of material 40. At a minimum, the latter comprises at least one support surface 52.1 and at least one side surface 54.1.

Le dispositif de bridage comprend au moins une bride 56 solidarisée de manière démontable à la table d'usinage 42 et configurée pour coopérer avec le bloc de matière 40 en fonctionnement de manière à le maintenir immobile contre la surface de pose 42.1 de la table d'usinage 42.The clamping device comprises at least one clamp 56 secured in a removable manner to the machining table 42 and configured to cooperate with the block of material 40 in operation so as to keep it immobile against the resting surface 42.1 of the work table. machining 42.

Le dispositif de bridage comprend généralement plusieurs brides 56 réparties le long des première et deuxième surfaces latérales 54.1, 54.2. Selon une configuration, le dispositif de bridage comprend au moins une première bride 56 coopérant en fonctionnement avec la première surface latérale 54.1 du bloc de matière 40 et au moins une deuxième bride 56' coopérant en fonctionnement avec la deuxième surface latérale 54.2.The clamping device generally comprises several clamps 56 distributed along the first and second side surfaces 54.1, 54.2. According to one configuration, the clamping device comprises at least one first flange 56 cooperating in operation with the first side surface 54.1 of the block of material 40 and at least one second flange 56' cooperating in operation with the second side surface 54.2.

Selon un mode de réalisation, la bride 56 comprend un corps 58 qui présente une première face 60 orientée vers la table d'usinage 42 en fonctionnement, au moins une face frontale 62, 62' orientée vers le bloc de matière 40 en fonctionnement ainsi qu'au moins un trou taraudé 64 débouchant au moins partiellement au niveau de la face frontale 62, 62'. La première face 60 et la face frontale 62, 62' sont sensiblement planes. La première face 60 et la face frontale 62, 62' forment entre elles un angle complémentaire à l'angle formé par la première surface d'appui 52.1 et l'une des première et deuxième surfaces latérales 54.1, 54.2 du bloc de matière 40. Lorsque les surfaces latérales 54.1, 54.2 du bloc de matière 40 sont perpendiculaires à la première surface d'appui 52.1, alors la première face 60 et la face frontale 62, 62' sont perpendiculaires.According to one embodiment, the flange 56 comprises a body 58 which has a first face 60 oriented towards the machining table 42 in operation, at least one end face 62, 62' oriented towards the block of material 40 in operation as well as 'at least one tapped hole 64 opening out at least partially at the front face 62, 62'. The first face 60 and the front face 62, 62' are substantially planar. The first face 60 and the front face 62, 62' form between them an angle complementary to the angle formed by the first support surface 52.1 and one of the first and second side surfaces 54.1, 54.2 of the block of material 40. When the side surfaces 54.1, 54.2 of the block of material 40 are perpendicular to the first bearing surface 52.1, then the first face 60 and the front face 62, 62' are perpendicular.

La première face 60 et la face frontale 62, 62' s'étendent entre des première et deuxième faces latérales 66.1, 66.2 approximativement parallèles entre elles et approximativement perpendiculaires à la première face 60 et à la face frontale 62, 62'.The first face 60 and the front face 62, 62' extend between first and second side faces 66.1, 66.2 approximately parallel to each other and approximately perpendicular to the first face 60 and to the front face 62, 62'.

Pour la suite de la description, une direction longitudinale est perpendiculaire à la face frontale 62, 62'. Un plan longitudinal est un plan perpendiculaire à la première face 60 et la face frontale 62, 62'. Un plan longitudinal médian est équidistant des première et deuxième faces latérales 66.1, 66.2.For the rest of the description, a longitudinal direction is perpendicular to the front face 62, 62'. A longitudinal plane is a plane perpendicular to the first face 60 and the front face 62, 62'. A median longitudinal plane is equidistant from the first and second side faces 66.1, 66.2.

En fonctionnement, la première face 60 et la face frontale 62, 62' peuvent être plaquées respectivement contre la surface de pose 42.1 de la table d'usinage 42 et l'une des surfaces latérales 54.1, 54.2 du bloc de matière 40.In operation, the first face 60 and the front face 62, 62' can be pressed respectively against the bearing surface 42.1 of the machining table 42 and one of the side surfaces 54.1, 54.2 of the block of material 40.

Selon une configuration, chaque trou taraudé 64 présente un axe A64, positionné dans un plan longitudinal médian, formant un angle non nul avec la première face 60 et la face frontale 62, 62'. L'axe A64 forme avec la face frontale 62, 62' un angle compris entre 30 et 60°.According to one configuration, each tapped hole 64 has an axis A64, positioned in a median longitudinal plane, forming a non-zero angle with the first face 60 and the front face 62, 62'. The axis A64 forms with the front face 62, 62' an angle of between 30 and 60°.

La bride 56 comprend, en plus du corps 58, au moins une vis pointeau 68 se vissant dans le trou taraudé 64 en fonctionnement. Chaque vis pointeau 68 présente une tête 70 pour la visser et la dévisser ainsi qu'une tige filetée 72 configurée pour se visser dans le trou taraudé 64, comportant une extrémité libre pointue 72.1 configurée pour pénétrer dans le bloc de matière 40 en fonctionnement lors d'un vissage de la vis pointeau 68.The flange 56 comprises, in addition to the body 58, at least one set screw 68 which screws into the tapped hole 64 in operation. Each conical screw 68 has a head 70 for screwing and unscrewing it as well as a threaded rod 72 configured to be screwed into the tapped hole 64, comprising a pointed free end 72.1 configured to penetrate into the block of material 40 in operation during a screwing of the needle screw 68.

La vis pointeau 68 est réalisée en un matériau plus dur que le bloc de matière 40 pour permettre à son extrémité libre pointue 72.1 de pénétrer dans le bloc de matière 40. En fonctionnement, la vis pointeau 68 est configurée pour occuper une position en retrait dans laquelle elle n'est pas en saillie par rapport à la face frontale 62, 62' et une position sortie dans laquelle l'extrémité libre pointue 72.1 de la vis pointeau 68 est en saillie par rapport à la face frontale 62, 62'.The needle screw 68 is made of a harder material than the block of material 40 to allow its pointed free end 72.1 to penetrate the block of material 40. In operation, the needle screw 68 is configured to occupy a recessed position in which it does not project with respect to the front face 62, 62' and an extended position in which the pointed free end 72.1 of the needle screw 68 projects with respect to the front face 62, 62'.

Selon un mode de réalisation visible sur la figure 6, la face frontale 62 est plane et le corps 58 de la bride ne comprend pas de nez.According to an embodiment visible on the figure 6 , the front face 62 is flat and the body 58 of the flange does not include a nose.

Selon un mode de réalisation de l'invention visible sur les figures 3 à 5 et 7 à 10, le corps 58 comprend un nez 74. Selon ce mode de réalisation, le corps 58 comprend une première face frontale 62 ainsi qu'une nervure, en saillie par rapport à la première face frontale 62 et formant le nez 74, présentant une deuxième face frontale 62' parallèle à la première face frontale 62 ainsi que des premier et deuxième chants 76.1, 76.2 reliant les première et deuxième faces frontales 62, 62', approximativement parallèles à la première face 60 du corps 58 de la bride 56.According to an embodiment of the invention visible on the figures 3 to 5 and 7 to 10 , the body 58 comprises a nose 74. According to this embodiment, the body 58 comprises a first front face 62 as well as a rib, projecting with respect to the first front face 62 and forming the nose 74, having a second face front 62' parallel to the first front face 62 as well as first and second edges 76.1, 76.2 connecting the first and second front faces 62, 62', approximately parallel to the first face 60 of the body 58 of the flange 56.

Le nez 74, notamment sa deuxième face frontale 62' ainsi que ses premier et deuxième chants 76.1, 76.2, est dimensionné pour se loger dans la rainure 50 du bloc de matière 40 lors d'une deuxième phase d'usinage et permettre un plaquage efficace du bloc de matière 40 contre la table d'usinage 42 lorsque le premier chant 76.1 du nez 74, le plus proche de la première face 60, est en contact avec le bloc de matière 40.The nose 74, in particular its second front face 62' as well as its first and second edges 76.1, 76.2, is sized to be housed in the groove 50 of the block of material 40 during a second machining phase and allow effective plating of the block of material 40 against the machining table 42 when the first edge 76.1 of the nose 74, closest to the first face 60, is in contact with the block of material 40.

Selon un mode de réalisation, le nez 74 s'étend de la première face latérale 66.1 jusqu'à la deuxième face latérale 66.2.According to one embodiment, the nose 74 extends from the first side face 66.1 to the second side face 66.2.

Selon une configuration, le trou taraudé 64 débouche au niveau de la deuxième face frontale 62' et du premier chant 76.1. L'axe A64 du trou taraudé 64 est sécant avec une arête 78 reliant la deuxième face frontale 62' et le premier chant 76.1.According to one configuration, the tapped hole 64 opens at the level of the second front face 62' and of the first edge 76.1. The axis A64 of the tapped hole 64 intersects with an edge 78 connecting the second front face 62' and the first edge 76.1.

Selon un mode de réalisation visible sur la figure 5, le corps 58 de la bride 56 comprend une deuxième face 60' parallèle à la première face 60. La première face frontale 62 s'étend d'un premier bord 62.1 dans le prolongement de la première face 60 jusqu'à un second bord 62.2, décalé par rapport à la deuxième face 60', relié à cette dernière par une surface qui présente un pan incliné 80 approximativement perpendiculaire à l'axe A64 du trou taraudé 64. Le nez 74 est distant des premier et second bords 62.1, 62.2.According to an embodiment visible on the figure 5 , the body 58 of the flange 56 comprises a second face 60' parallel to the first face 60. The first front face 62 extends from a first edge 62.1 in the extension of the first face 60 to a second edge 62.2 , offset from the second face 60 ', connected to the latter by a surface which has an inclined face 80 approximately perpendicular to the axis A64 of the tapped hole 64. The nose 74 is distant from the first and second edges 62.1, 62.2.

Selon un mode de réalisation visible sur la figure 4, le corps 58 comprend au moins un insert 82 comportant le trou taraudé 64 et inséré dans un trou lisse 84 du corps 58. Ainsi, si les filets du trou taraudé 64 sont usés seul l'insert 82 est remplacé et non tout le corps 58. Chaque bride 56 comprend également un système de liaison 86 pour la relier de manière démontable à la table d'usinage 42.According to an embodiment visible on the figure 4 , the body 58 comprises at least one insert 82 comprising the tapped hole 64 and inserted into a smooth hole 84 of the body 58. Thus, if the threads of the tapped hole 64 are worn, only the insert 82 is replaced and not the entire body 58 Each flange 56 also includes a connection system 86 to releasably connect it to the machining table 42.

Selon un mode de réalisation, le système de liaison 86 comprend un lardon 88 configuré pour être inséré dans une rainure en T 44 de la table d'usinage 42, au moins un trou de passage 90, prévu au niveau du corps 58 de la bride 56, débouchant au niveau des première et deuxième faces 60, 60' du corps 58, ainsi qu'au moins une vis 92, une pour chaque trou de passage 90, qui présente une tête 92.1, configurée pour prendre appui contre la deuxième face 60' du corps 58, et une tige filetée 92.2 configurée pour se loger dans le trou de passage 90 et se visser dans le lardon 88. Selon une configuration, le système de liaison 86 comprend deux trous de passage 90 positionnés dans le plan longitudinal médian.According to one embodiment, the connection system 86 comprises a gib 88 configured to be inserted into a T-slot 44 of the machining table 42, at least one passage hole 90, provided at the level of the body 58 of the flange 56, emerging at the level of the first and second faces 60, 60' of the body 58, as well as at least one screw 92, one for each passage hole 90, which has a head 92.1, configured to bear against the second face 60 'of the body 58, and a threaded rod 92.2 configured to fit into the passage hole 90 and screw into the gib 88. According to one configuration, the connecting system 86 comprises two passage holes 90 positioned in the median longitudinal plane.

Selon un mode de réalisation, chaque trou de passage 90 a un diamètre légèrement supérieur à celui de la tige filetée 92.2 de la vis 92 pour permettre une légère inclinaison du corps 58 de la bride 56 lorsque le nez 74 est utilisé pour maintenir le bloc de matière 40. Selon un mode de réalisation, le corps 58 et le lardon 88 de la bride 56 sont en acier traité. A titre d'exemple, les vis 92 sont des vis M12 et la vis pointeau 68 une vis M10.According to one embodiment, each passage hole 90 has a diameter slightly greater than that of the threaded rod 92.2 of the screw 92 to allow a slight inclination of the body 58 of the flange 56 when the nose 74 is used to hold the block of material 40. According to one embodiment, the body 58 and the gib 88 of the flange 56 are made of treated steel. By way of example, screws 92 are M12 screws and needle screw 68 is an M10 screw.

Selon un mode de réalisation visible sur les figures 11 et 12, la bride 56 comprend une cale 98 reliée de manière démontable au corps 58, positionnée sur la première face 60, en saillie par rapport à ladite première face 60 de sorte que cette première face 60 soit légèrement espacée de la surface de pose 42.1 de la table d'usinage 42 en fonctionnement.According to an embodiment visible on the figures 11 and 12 , the flange 56 comprises a wedge 98 removably connected to the body 58, positioned on the first face 60, projecting relative to said first face 60 so that this first face 60 is slightly spaced from the laying surface 42.1 of the machining table 42 in operation.

Selon une configuration, le corps 58 comprend un logement 100, configuré pour loger la cale 98, positionné à l'intersection de la première face 60 et de la face arrière 102 du corps 58. Ce logement 100 s'étend sur toute la largeur du corps 58. En complément, la cale 98 a une section rectangulaire et s'étend sur toute la largeur du corps 58. La cale 98 et le logement 100 sont dimensionnés de sorte que la cale 98 soit légèrement en saillie, de l'ordre du millimètre, par rapport à la première face 60 du corps.According to one configuration, the body 58 comprises a housing 100, configured to house the wedge 98, positioned at the intersection of the first face 60 and the rear face 102 of the body 58. This housing 100 extends over the entire width of the body 58. In addition, the wedge 98 has a rectangular section and extends over the entire width of the body 58. The wedge 98 and the housing 100 are dimensioned so that the wedge 98 projects slightly, of the order of millimeter, relative to the first face 60 of the body.

La cale 98 est reliée au corps 58 par des éléments de liaison 104 démontables, comme des vis par exemple.The wedge 98 is connected to the body 58 by removable connecting elements 104, such as screws for example.

La cale 98 est réalisée en un matériau moins dur que la table d'usinage 42 pour limiter les risques d'endommagement de cette table d'usinage 42. La cale 98 est démontable pour pouvoir la changer, sans changer toute la bride 56 lorsqu'elle est usée.The wedge 98 is made of a material less hard than the machining table 42 to limit the risk of damage to this machining table 42. The wedge 98 can be removed to be able to change it, without changing the entire flange 56 when it is worn out.

L'utilisation de la bride 56 est décrite au regard des figures 7 à 9.The use of flange 56 is described with regard to figures 7 to 9 .

Initialement, le bloc de matière 40, dépourvu de rainure, est posé sur la table d'usinage 42. Les brides 56 sont réparties de part et d'autre du bloc de matière 40, le lardon 88 de chacune d'elles étant introduit dans la rainure en T 44 de la table d'usinage 42.Initially, the block of material 40, devoid of a groove, is placed on the machining table 42. The flanges 56 are distributed on either side of the block of material 40, the gib 88 of each of them being introduced into the T-slot 44 of the work table 42.

Le procédé de bridage comprend une étape de déplacement des brides 56 sur la table d'usinage 42 jusqu'à ce que la deuxième face frontale 62' de chaque bride 56 soit en contact avec le bloc de matière 40, les vis pointeaux 68 étant en position en retrait ; une étape de serrage d'au moins une vis 92 du système de liaison 86 de chaque bride 56 à un premier couple de serrage, par exemple de l'ordre de 80N.m, pour immobiliser chaque bride 56 par rapport à la table d'usinage 42 ; puis une étape de vissage des vis pointeaux 68 à un deuxième couple de serrage, inférieur au premier couple de serrage, de l'ordre de 30 N.m afin que l'extrémité libre pointue 72.1 de chaque vis pointeau 68 pénètre dans la matière du bloc de matière 40.The clamping method comprises a step of moving the clamps 56 on the work table 42 until the second end face 62' of each clamp 56 is in contact with the block of material 40, the needle screws 68 being in recessed position; a step of tightening at least one screw 92 of the connection system 86 of each flange 56 to a first tightening torque, for example of the order of 80N.m, to immobilize each flange 56 with respect to the table of machining 42; then a step of screwing the needle screws 68 to a second tightening torque, lower than the first tightening torque, of the order of 30 N.m so that the pointed free end 72.1 of each needle screw 68 penetrates into the material of the block of material 40.

Ainsi, comme illustré sur la figure 7, le bloc de matière 40 est maintenu immobile par les différentes brides 56. Le dispositif de bridage de l'invention peut aussi bien maintenir immobile un bloc de matière 40 sur une table d'usinage horizontale, comme illustré sur la figure 7, que sur une table d'usinage 42 verticale, comme illustré sur la figure 10.Thus, as illustrated in the figure 7 , the block of material 40 is held stationary by the various flanges 56. The clamping device of the invention can also hold a block of material 40 stationary on a horizontal work table, as illustrated in the figure 7 , than on a vertical machining table 42, as illustrated in the figure 10 .

Selon un mode de réalisation, le procédé d'usinage du bloc de matière 40 comprend une première phase d'usinage lors de laquelle la première surface d'appui 52.1 du bloc de matière 40 est maintenue plaquée contre la table d'usinage 42 grâce aux brides 56, comme précédemment décrit, et une rainure 50 réalisée sur l'une des surfaces latérales 54.1, 54.2 du bloc de matière 40, en utilisant un outil standard, comme illustré sur la figure 8. Selon un mode opératoire, une rainure 50 est réalisée sur chacune des surfaces latérales 54.1 et 54.2 du bloc de matière. D'autres opérations d'usinage peuvent être réalisées sur la deuxième surface d'appui 52.2According to one embodiment, the method of machining the block of material 40 comprises a first phase of machining during which the first support surface 52.1 of the block of material 40 is kept pressed against the machining table 42 thanks to the flanges 56, as previously described, and a groove 50 made on one of the side surfaces 54.1, 54.2 of the block of material 40, using a standard tool, as illustrated in the figure 8 . According to one procedure, a groove 50 is made on each of the side surfaces 54.1 and 54.2 of the block of material. Other machining operations can be performed on the second bearing surface 52.2

A l'issue de la première phase d'usinage, les vis pointeaux 68 et les vis 92 des brides 56 sont dévissées. Le bloc de matière 40 peut alors être retourné, de manière à plaquer sa deuxième surface d'appui 52.2 contre la table d'usinage 42. La vis pointeau 68 de chaque bride 56 étant en position de retrait, les brides 56 sont déplacées jusqu'à ce que le nez 74 de chacune d'elles soit introduit dans l'une des rainures 50 du bloc de matière 40. Il suffit alors de visser les vis 92 de chaque bride 56 pour maintenir immobilisé le bloc de matière 40 sur la table d'usinage 42 et débuter une deuxième phase d'usinage. Pour obtenir un effort de plaquage, la distance entre la rainure 50 et la deuxième surface d'appui 52.2 doit être supérieure à la distance séparant le nez 74 et la première face 60 du corps 58 de la bride 56.At the end of the first machining phase, the set screws 68 and the screws 92 of the flanges 56 are unscrewed. The block of material 40 can then be turned over, so as to press its second support surface 52.2 against the machining table 42. The grub screw 68 of each flange 56 being in the retracted position, the flanges 56 are moved up to that the nose 74 of each of them is introduced into one of the grooves 50 of the block of material 40. It is then sufficient to screw the screws 92 of each flange 56 to keep the block of material 40 immobilized on the table. machining 42 and start a second phase of machining. To obtain a pressing force, the distance between the groove 50 and the second bearing surface 52.2 must be greater than the distance separating the nose 74 and the first face 60 of the body 58 of the flange 56.

Ainsi, la même bride 56 visible sur les figures 3 à 5 et 7 à 10 permet de pouvoir brider le bloc de matière 40 en utilisant soit la vis pointeau 68 soit le nez 74. Le bridage du bloc de matière 40 en utilisant le nez 74 permet de limiter les risques de déformation du bloc de matière 40, l'effort de plaquage 94 exercé par la bride 56 sur le bloc de matière 40 étant orienté uniquement selon une direction perpendiculaire à la surface de pose 42.1 de la table d'usinage 42 alors que le bridage du bloc de matière 40 en utilisant la vis pointeau 68 génère un effort de plaquage 96 avec une composante perpendiculaire à la surface de pose 42.1 de la table d'usinage 42 et une composante parallèle à la surface de pose 42.1 de la table d'usinage 42 qui peut tendre à déformer le bloc de matière 40 en fonction de sa géométrie.Thus, the same flange 56 visible on the figures 3 to 5 and 7 to 10 allows the block of material 40 to be clamped using either the needle screw 68 or the nose 74. The clamping of the block of material 40 using the nose 74 makes it possible to limit the risks of deformation of the block of material 40, the effort of plating 94 exerted by the flange 56 on the block of material 40 being oriented only in a direction perpendicular to the bearing surface 42.1 of the machining table 42 while the clamping of the block of material 40 using the needle screw 68 generates a pressing force 96 with a component perpendicular to the bearing surface 42.1 of the machining table 42 and a component parallel to the bearing surface 42.1 of the machining table 42 which may tend to deform the block of material 40 depending of its geometry.

Claims (11)

  1. Clamp for retaining a block (40) of material on a machining table (42), the clamp comprising a body (58) having a first face (60) and at least one first front face (62) respectively oriented toward the machining table (42) and the block (40) of material when in use, as well as a connecting system (86) for connecting the clamp in a demountable manner to the machining table (42), characterized in that the body (58) of the clamp (56) comprises a nose (74) projecting relative to the first front face (62) having a second front face (62') parallel to the first front face (62) as well as first and second edges (76.1, 76.2) connecting the first and second front faces (62, 62'), said nose (74) being sized to be housed in a groove in a block (40) of material when in use, in that the body (58) comprises at least one internally threaded hole (64) opening at least partly at the level of the second front face (62') and having an axis (A64) forming a non-zero angle with the first face (60) and the second front face (62') and in that the clamp (56) comprises at least one grub screw (68) that screws into the internally threaded hole (64) having a pointed free end (72.1) configured to penetrate into the block (40) of material when in use when screwing in the grub screw (68).
  2. Clamp as claimed in claim 1, characterized in that the axis (A64) of the internally threaded hole (64) forms with the second front face (62') an angle between 30 and 60° inclusive.
  3. Clamp as claimed in either one of the preceding claims, characterized in that the body (58) comprises at least one insert (82) including the internally threaded hole (64).
  4. Clamp as claimed in any one of the preceding claims, characterized in that the connecting system (86) comprises a gib (88) configured to be inserted in a T-shaped groove (44) of the machining table (42) when in use, at least one through-hole (90) at the level of the body (58) of the clamp (56) as well as at least one screw (92), one for each through-hole (90), including a threaded shank (92.2) configured to be housed in the through-hole (90) and to be screwed into the gib (88), each through-hole (90) having a diameter slightly greater than that of the threaded shank (92.2) of the screw (92).
  5. Clamp as claimed in any one of the preceding claims, characterized in that the internally threaded hole (64) opens at the level of the second front face (62') and of the first edge (76.1) closest to the first face (60).
  6. Clamp as claimed in the preceding claim, characterized in that the axis (A64) of the internally threaded hole (64) intersects an edge (78) connecting the second front face (62') and the first edge (76.1).
  7. Clamp as claimed in any one of the preceding claims, characterized in that the clamp (56) comprises a shim (98) connected in a removable manner to the body (58), positioned on the first face (60) and projecting relative to said first face (60) .
  8. Clamping device comprising at least one clamp as claimed in any one of the preceding claims.
  9. Method of clamping a block (40) of material onto a machining table (42), characterized in that the method of clamping comprises a step of moving clamps (56) as claimed in any one of claims 1 to 7 on the machining table (42) until the nose (74) of each clamp (56) is in contact with the block (40) of material, the grub screw (68) of each clamp (56) not projecting relative to the second front face (62'), a step of tightening at least one screw (92) of the connecting system (86) of each clamp (56) to a first clamping torque to immobilize each clamp (56) relative to the machining table (42), followed by a step of screwing the grub screw (68) of each clamp (56) to a second clamping torque in order for the pointed free end (72.1) of the grub screw (68) to penetrate into the material of the block (40) of material.
  10. Method of clamping as claimed in the preceding claim, characterized in that the second clamping torque is less than the first clamping torque.
  11. Method of machining a block (40) of material comprising two bearing surfaces (52.1, 52.2) and at least one lateral surface (54.1, 54.2), characterized in that the machining method comprises a first machining phase during which the first bearing surface (52.1) of the block (40) of material is held pressed against the machining table (42) thanks to clamps (56) as claimed in any one of claims 5 to 7, using the clamping method as claimed in either one of claims 9 or 10, and a groove (50) is then produced on one of the lateral surfaces (54.1, 54.2) of the block (40) of material, as well as a second machining phase during which the second bearing surface (52.2) of the block (40) of material is held pressed against the machining table (42) thanks to the clamps (56), the grub screw of each clamp (56) not projecting relative to the second front surface (62') and the nose of each clamp (56) being housed in the groove (50).
EP20193981.6A 2019-09-09 2020-09-01 Clamp for holding a block of material on a machining table, clamping device comprising said clamp and method for clamping a block of material on a machining table Active EP3789160B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1909889A FR3100469A1 (en) 2019-09-09 2019-09-09 Flange for holding a block of material on a work table, clamping device comprising said flange and method of clamping a block of material on a work table

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EP3789160A1 EP3789160A1 (en) 2021-03-10
EP3789160B1 true EP3789160B1 (en) 2022-04-20

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EP20193981.6A Active EP3789160B1 (en) 2019-09-09 2020-09-01 Clamp for holding a block of material on a machining table, clamping device comprising said clamp and method for clamping a block of material on a machining table

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US (1) US11407072B2 (en)
EP (1) EP3789160B1 (en)
FR (1) FR3100469A1 (en)

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Publication number Priority date Publication date Assignee Title
CN113427295A (en) * 2021-07-06 2021-09-24 安徽天航机电有限公司 Flexible workpiece clamp for machining center
GB2618077A (en) * 2022-04-25 2023-11-01 Sixpence Ind Ltd A guide rail securing device and method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1442833B1 (en) * 2003-01-22 2006-12-20 Dassault Aviation Clamping crampon and method for clamping a workpiece with such clamping crampons

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Publication number Priority date Publication date Assignee Title
US4198038A (en) * 1978-08-21 1980-04-15 T. E. Co. Device for clamping a workpiece to a supporting surface
US4772000A (en) * 1987-01-05 1988-09-20 Dahlgren Control Systems, Inc. Clamping device
US9364934B2 (en) * 2013-06-09 2016-06-14 Ryszard WAWRO Clamping device
CN103480861B (en) * 2013-08-30 2016-01-20 南京梅山冶金发展有限公司 A kind of method for turning of large-scale parts of thin plate disks end face

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1442833B1 (en) * 2003-01-22 2006-12-20 Dassault Aviation Clamping crampon and method for clamping a workpiece with such clamping crampons

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US11407072B2 (en) 2022-08-09
EP3789160A1 (en) 2021-03-10
FR3100469A1 (en) 2021-03-12
US20210069841A1 (en) 2021-03-11

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